<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822022000100014</article-id>
<article-id pub-id-type="doi">10.18845/tm.v35i1.5436</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Densidad seca al aire y características cuantitativas de elementos xilemáticos de conducción en 10 especies de Malvaceae en Venezuela]]></article-title>
<article-title xml:lang="en"><![CDATA[Air dry density and quantitative features of conduction xylem elements in 10 species of Malvaceae in Venezuela]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uzcátegui-Rojas]]></surname>
<given-names><![CDATA[Mariangel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valero]]></surname>
<given-names><![CDATA[Styles W.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Hernández]]></surname>
<given-names><![CDATA[Williams J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Los Andes Facultad de Ciencias Forestales y Ambientales Laboratorio de Anatomía de Maderas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Los Andes Facultad de Ciencias Forestales y Ambientales Laboratorio Nacional de Productos Forestales]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Los Andes Facultad de Ciencias Forestales y Ambientales Laboratorio de Anatomía de Maderas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>14</fpage>
<lpage>27</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822022000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822022000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822022000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se presenta el estudio de la relación entre la densidad seca al aire y características cuantitativas de los vasos (frecuencia y diámetro de vasos, área de lumen) para diez especies de Malvaceae que crecen en Venezuela: Catostemma commune, Eryotheca globosa, Ochroma pyramidale, Pachira quinata, Guazuma ulmifolia, Apeiba tibourbou, Heliocarpus americanus, Uladendron codesurii, Sterculia apetala y Sterculia pruriens. La densidad se determinó en muestras acondicionadas al 12 % de humedad y para la medición de las características de los vasos se prepararon láminas de secciones transversales utilizando los procedimientos convencionales de microtecnia xilemática. Las mayores frecuencias y menores diámetros de vasos se presentaron en Guazuma ulmifolia y Uladendron codesurii; mientras que las menores frecuencias y mayores diámetros de vasos los presentaron especies de las subfamilias Bombacoideae y Sterculioideae. La densidad seca al aire mostró un alto grado de variación, encontrándose especies que van desde la categoría de muy baja densidad (Ochroma pyramidale, Pachira quinata, Apeiba tibourbou, Heliocarpus americanus, Sterculia apetala) hasta muy alta densidad (Uladendron codesurii). La relación entre la densidad y las características de los vasos presentó una baja correlación lo que indica la posible existencia de otras características anatómicas que ejercen mayor influencia sobre esta propiedad física.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This research is about the relation between air dry density and quantitative features of vessels (frequency and diameter, lumen area) for ten species of Malvaceae from Venezuela: Catostemma commune, Eryotheca globosa, Ochroma pyramidale, Pachira quinata, Guazuma ulmifolia, Apeiba tibourbou, Heliocarpus americanus, Uladendron codesurii, Sterculia apetala and Sterculia pruriens. Density was determined in samples with moisture content equal to 12 % and measures of vessels features were realized in slides samples of cross sections using standards procedures in xylem microtechnique. Higher vessels frequencies and lower diameters were observed in Guazuma ulmifolia and Uladendron codesurii and lower frequencies and higher diameters were observed in species from Bombacoideae and Sterculioideae subfamilies. Air dry density shows a high variation, ranging from very low density (Ochroma pyramidale, Pachira quinata, Apeiba tibourbou, Heliocarpus americanus, Sterculia apetala) to very high density (Uladendron codesurii). A low correlation between density and vessels features was found and its possible that others wood anatomy features have a higher effect over wood density for Malvaceae.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Anatomía madera]]></kwd>
<kwd lng="es"><![CDATA[densidad madera]]></kwd>
<kwd lng="es"><![CDATA[relación]]></kwd>
<kwd lng="es"><![CDATA[propiedades físicas]]></kwd>
<kwd lng="es"><![CDATA[vasos]]></kwd>
<kwd lng="en"><![CDATA[Wood anatomy]]></kwd>
<kwd lng="en"><![CDATA[wood density]]></kwd>
<kwd lng="en"><![CDATA[relationship]]></kwd>
<kwd lng="en"><![CDATA[physical properties]]></kwd>
<kwd lng="en"><![CDATA[vessels]]></kwd>
</kwd-group>
</article-meta>
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